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Date:   Mon, 25 Jul 2022 09:38:35 -0700
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Subject: Re: [PATCH 1/2] scsi: ufs: Add Multi-Circular Queue support
To:     Avri Altman <Avri.Altman@wdc.com>, Can Guo <quic_cang@quicinc.com>,
        "bvanassche@acm.org" <bvanassche@acm.org>,
        "stanley.chu@mediatek.com" <stanley.chu@mediatek.com>,
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        "beanhuo@micron.com" <beanhuo@micron.com>,
        "quic_nguyenb@quicinc.com" <quic_nguyenb@quicinc.com>,
        "quic_ziqichen@quicinc.com" <quic_ziqichen@quicinc.com>,
        "linux-scsi@vger.kernel.org" <linux-scsi@vger.kernel.org>,
        "kernel-team@android.com" <kernel-team@android.com>
CC:     "James E.J. Bottomley" <jejb@linux.ibm.com>,
        "Martin K. Petersen" <martin.petersen@oracle.com>,
        Daejun Park <daejun7.park@samsung.com>,
        Jinyoung Choi <j-young.choi@samsung.com>,
        Kiwoong Kim <kwmad.kim@samsung.com>,
        open list <linux-kernel@vger.kernel.org>
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From:   "Asutosh Das (asd)" <quic_asutoshd@quicinc.com>
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On 7/23/2022 9:07 PM, Avri Altman wrote:
>> @@ -2558,7 +2587,8 @@ void ufshcd_prepare_utp_scsi_cmd_upiu(struct
>> ufshcd_lrb *lrbp, u8 upiu_flags)
>>                                  UPIU_TRANSACTION_COMMAND, upiu_flags,
>>                                  lrbp->lun, lrbp->task_tag);
>>          ucd_req_ptr->header.dword_1 = UPIU_HEADER_DWORD(
>> -                               UPIU_COMMAND_SET_TYPE_SCSI, 0, 0, 0);
>> +                               UPIU_COMMAND_SET_TYPE_SCSI |
>> +                               (lrbp->hw_queue_id << 4), 0, 0, 0);
> This is fine, as long as we have 16 queues or less.
> Otherwise, we need to fill the EXT_IID as well (only if bEXTIIDEn = 1).
> 
Yes, correct. Will add the code for EXT_IID in the next version.

> Also, don't we need to do this for query commands as well?
> Or at least add a comment that the queue id for query command is 0.
> 
Query commands would use the reserved queue whose id = 0.
I agree a comment should be added detailing this.
Will add in the next version.

> Thanks,
> Avri